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Automotive electronic ignition circuit

2017-08-04 07:56  
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This article describes the automotive electronic ignition circuit. The circuit is very useful, it is worth Duokanjibian then master the principles of the theory. In this circuit T1 / T2 creates a monostable multivibrator, C2 and R5 determine the length of the impulse is 1,5 ms. At the back of the T3 and T4, Darlington and then used a specially developed electronic ignition switch is turned on / off the primary coil. Impulses from the switch P to open the T1 / T2 monostable multivibrator. You need to connect capacitors United Nations, in the distributor cap, because no longer need it. Although P is closed, the switch in the off state, but T1, T2 in the state, T3 and T4, so that the current flow of the primary coil groove. When the switch P to open, T1, you can get a short lead nation C2 charge more than R6 makes T2 go off, because the voltage drop across R6. When T2 is turned off, is also off T3, T4 and current flowing trough the primary winding is stopped. Because T2 is turned off, the voltage is increased in the R8 R5 which is passing through the base of T1 and C2 is still in the country is still charging. In 1,5 milliseconds. C2 value reaches the level at T2 and T1 re-enter the off state. Now T2, T3 and T4 in the state, once again, and the current flows trough primary coil again. R2 and D1 is used to neutralize the impact of impulses caused? Jump too? P switch to open when it should not monostable multivibrator. Zener diode Z5 and Z6 are together with R10 limit overcharges voltage pulse is due to the self-inductance of the primary coil, may impair T4. They should be connected as close as possible T4. D7 protect the device from the wrong polarity. Coils should be better than 1:10 0 roofs or with an external resistor RV for better cooling. Total anti-values ??(Rp) of the primary coil and the RV should not fall below 1,6 ohm resistor so the current trough T4 no greater than 10 a.
According Rp, R9 have different values:
120 u / 2 w as Rp tot> 2,2 u
100 u / 2 w 1,8 u <Rp tot <2,2 u
82 u / 3 w 1,5 u <Rp tot <1,8 u
T4 must heatsinked!!!
All resistors are 1/2W / - 5%



Car ignition

D1-D4 = 1N4148
D5-D6 = BZX85C – 180 (replicable with all equivalent types with power of 1,3W)
D7 = 1N4001
R1 = 470 – 1W
R2 = 22k
R3 = 2,2k
R4 = 1k
R5 = 4,7k
R6 = 39k
R7 – R10 = 100
R8 = 680
C1 – C2 = 47nF (ceramic)
C3 = 0,22uF 400V (ceramic)
C4 = 100uF (electrolytic)
T1 – T2 = BC327  (BC327-25, BC327-40)
T3 = BC237B (BC547B, BC547C)
T4 = BUX37 (BU323, BU920, BU921, BU922, BUV37B (u TOP3), BUW29, BUW81, MJ10012, MJ10013, MJ10014, TIP662, TIP665, 2SD683)


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